Detection device for apparatus for analysis

Abstract

A detection device for an apparatus for carrying out analysis such as a chromatograph includes not only a detector for outputting detection signals but also a stabilization judging unit for measuring drift and noise of these detection signals over time and automatically transmitting a start signal which permits the apparatus for analysis to start its operations when the measured drift becomes smaller than a standard drift value such as one-tenth of the optical absorbance measured for a spectrum of an analyzed sample at the detection wavelength. A standard noise value setting unit may be further provided for receiving detection signals at detection wavelength while a standard sample is placed inside a detection cell, calculating a standard noise value on the basis of intensity of the detection signals, and transmitting the calculated standard noise value to the stabilization judging unit. A standard drift value setting unit may also be further provided in the case of a chromatograph with a column for storing standard drift values corresponding to measured temperature of the column when measurements are taken by the chromatograph and transmitting the retrieved drift value to the stabilization judging unit.

What is claimed is:  
     
       1. A detection device for an apparatus for carrying out materials analysis, said detection device comprising: 
       a detector for outputting detection signals; and  
       a stabilization judging unit for measuring drift and noise of said detection signals over time and automatically transmitting a start signal which permits said apparatus to start said analysis when the measured drift becomes smaller than a standard drift value and the measured noise becomes smaller than a standard noise value.  
     
     
       2. The detection device of  claim 1  further comprising: 
       a detection cell; and  
       a standard noise value setting means unit for receiving detection signals at a detection wavelength while a standard sample is placed inside said detection cell, calculating a standard noise value on the basis of intensity of said detection signals as one-tenth of the optical absorbance measured for spectrum of an analyzed sample at said detection wavelength, and transmitting said calculating standard noise value to said stabilization judging unit.  
     
     
       3. The detection device of  claim 1  wherein said apparatus is a chromatograph having a column, said detection device further comprising a standard drift value setting unit for storing standard drift values corresponding to temperatures of said column, retrieving one of said stored standard drift values corresponding to measured temperature of said column when measurements are taken by said detection device and transmitting the retrieved standard drift value to said stabilization judging unit. 
     
     
       4. The detection device of  claim 2  wherein said apparatus is a chromatograph having a column, said detection device further comprising a standard drift value setting unit for storing standard drift values corresponding to temperatures of said column, retrieving one of said stored standard drift values corresponding to measured temperature of said column when measurements are taken by said detection device and transmitting the retrieved standard drift value to said stabilization judging unit. 
     
     
       5. The detection device of  claim 1  further comprising means for storing a time length for measuring noise. 
     
     
       6. The detection device of  claim 2  further comprising means for storing a time length for measuring noise. 
     
     
       7. The detection device of  claim 3  further comprising means for storing a time length for measuring noise. 
     
     
       8. The detection device of  claim 4  further comprising means for storing a time length for measuring noise. 
     
     
       9. The detection device of  claim 1  further comprising means for storing a time length for measuring drift. 
     
     
       10. The detection device of  claim 2  further comprising means for storing a time length for measuring drift. 
     
     
       11. The detection device of  claim 3  further comprising means for storing a time length for measuring drift. 
     
     
       12. The detection device of  claim 4  further comprising means for storing a time length for measuring drift.